Rotating kiln for burning cement and the like



N. WINQVIST.

ROTATING KILN F'OR BURNING CEMENT AND THE LI'KE.

APPLlcAloN mib oc1.ao. 191s.

Patented M ay 16, 192.2.4

ATT/

NILS WINQVIST, OF TOLLARP, SWEDEN.

ROTATING KILN FOR BURNING CEMENT AND THE LIKE.

Specification of Letters Patent.

Patented May 16, 1922.

Application led October 3G, 1918.` Serial No. 260,369.

To ZZ wiz-om t may concern: Be it known that l, Nits NVINQvIsT, a subject of the King of Sweden, residing at rlollarp, Sweden, have invented new and useful Improvements in Rotating Kilns for Bru-ning (lement and the like, of which the following a specification.

It has already been proposed to provide rotating kilns for the burning of cement and the like with projections, or the like, on the walls of the preparatory heating zone, for the pnrposin amongl `other things, of giving greater heating surface. `These projections, however, have been arranged as drivers or catches which have carried the material np- `wards in the rotation of the kiln and have then let it fall again. This has taused a ronsiderable creation of dnst which has been all the greater that, for the purpose of effective heating, the n'iaterial has been as finely di vided as possible. Consequently, the greater heating.;` si'lrli'are is gained in these known ai rangements at the cost of a diminished ont pnt on the part of the kiln. j ln order to reniove this inconreniencc, the above-mentioned n'o"e ,'tions etc., are so foii'med in ac-` rordance with the present invention, that they do not contribute to lifting' the material (hiring the rotation of the kiln.` The form and arrangement of the projections, etc., ran be, for example', such that the projections only out or penetrate the n'iaterial daring the rotation of the kiln, and for this purper-ie there preferably adopted a good heat-conducting material, such as ironyfor example. They can, in addition, also be formed so that they present to the material to be burned only edges in the direction of rotation, lont, in other respects, have larger snril'aces which are so placed` that they do not carry the material to be treated, with them in the rotation. In this way there is avoided the creation of dnst and, at the saine time, the material is exposed to a large heating area.

In the a ifcem1ninying drawingthere is shown, only as an eramjile, a part of a rement-hin'ning kiln constructed in accordance with the present invention. Fig. l shows a longitudinal section of the kiln, and Fig. 2 a transverse section through the preparatory heating Zone of the kiln and nearer to the cement-feeding end of the same.

In that part of the preparatory zone which lies at the cement-feeding end, there are arranged on the walls of the kiln which are, as usual, lined with ireeproof stone or brick, projections in the shape of gates or frames l, of iron, for example, and open in the direction fof rotation. During the 'rotation of the kiln the gates or frames cut through the cement lont do` not carry the latter with them in the rotation. In this process a great heating vsurface is presented to the cement without it being necessary for the .latter to be carried along in the rotation and thus canse the before-mentioned creation of dust.` ln the drawing the gates or frames l are shown arranged in rows, with each row in one transverse-sectional plane, but they can.I of course, be arranged in many other ways.

lll/ith a kiln of the construction shown in the (lrawing ithas been found on experimenting, that the output of the kiln becomes nnnsufdly large and that a. considerable sparing of fuel made, all of which is plainly of ':cat importance from an .economie point of View.

The various partsI ,in the arrangement shown can be modified in respect of material, since, shape, number, composition and arrangement, and can he reversed' as long as the clniracteristic features of the invention are retained.

lWhat I claim is:

l. ln combination, a rotary kiln having a pre;iaratory heating zone, and fiat pr0jec tions extending from the wall of said Zone and leaving a free central passage in the kiln, said projections being spaced longi tndinally and cirrnmferentially of the kiln and having large surfaces parallel to the di rection of rotation and j iresenting thin edges and open spaces to the material in the direction of rotatitm thereby to prevent 'lifting of the material hy said projections during rotation.

In comljiination, a rot-ary kiln and a plurality of frames projecting inwardly from the inner wall of 'the kiln, said frames comprising sjjiaced t'ansversely disposed inembers, and longitudinal extending members connecting the latter.

In testimony whereof II have signed my naine to this specification.

NILS WINQVIST. 

